The circumstances which have caused Crusades

Crusades have not only general historical interest, as expression of ideas and mood of minds during the known period of medieval history. On the motives, and it is equal on the nearest consequences, in particular on various and deep influences on mutual relations of the East to the West, crusades aren't deprived special value for history of the East Europe people. Making rather important department in the West European history, crusades are plentiful the external facts and are rich with results which though have been bought by rather expensive price, but have powerfully affected spiritual development of the European people.